Time Difference: Paris and London
London is 1 hour behind Paris, all year. When it's 9:00 AM in Paris, it's 8:00 AM in London.
Daylight saving note: France and the UK change their clocks on the same weekends, the last Sunday in March and the last Sunday in October, so London is always 1 hour behind Paris.
London Runs One Hour Behind Paris
If you start in Paris, take one hour off to get London time. Paris uses CET in winter and CEST in summer, and London uses GMT and BST, so the offset is a steady one hour. 5:30 PM in Paris is 4:30 PM in London.
Both countries move their clocks forward on the last Sunday in March and back on the last Sunday in October, which is why this pair doesn't have a winter column and a summer column. One hour is the whole story.
The date can still slip near midnight. 12:15 AM in Paris is 11:15 PM the previous day in London, still the previous day. A message timestamped just after midnight in Paris may show as the day before to a London reader.
Paris to London Conversion Table
Each column is one real season of the Paris-London gap. Pick the column that matches your date.
| 🇫🇷 Paris (CET) | 🇬🇧 London (CET/CEST → GMT/BST) |
|---|---|
| 00:00 | 23:00(prev day) |
| 03:00 | 02:00 |
| 06:00 | 05:00 |
| 09:00 | 08:00 |
| 12:00 | 11:00 |
| 15:00 | 14:00 |
| 18:00 | 17:00 |
| 21:00 | 20:00 |
- CET/CEST → GMT/BST: every day of the year, because France and the UK change clocks on the same weekends
* "next day" / "prev day" = the converted time falls on a different calendar date.
Best Meeting Time for Paris and London
With 9-to-5 days on both sides, the shared window begins at 10:00 AM in Paris, when London opens, and runs to 5:00 PM in Paris. That's 9:00 AM to 4:00 PM in London. Paris finishes an hour before London does, so after 5:00 PM Paris time it's only 4:00 PM in London and the London team may still be working.
Avoiding Paris-London Time Mistakes
London is behind, so an early morning in Paris is still the previous calendar day in London. With a 1 hour gap, that applies to anything before 1:00 AM in Paris: 12:30 AM there is 11:30 PM the previous day in London.
The easiest mistake is adding the hour instead of subtracting it. A Paris 2:00 PM call is 1:00 PM in London. Going the other way, 9:00 AM in London is 10:00 AM in Paris, so Paris is already an hour into its day when London starts.
A Worked Example: A Paris Team Scheduling a London Review
Suppose a Paris team needs a London review after lunch. A 2:00 PM start in Paris is 1:00 PM in London, and a 4:00 PM start is 3:00 PM. The Paris team finishes first, so the later you go, the more London is the side that's still at work.
If London hosts at 9:00 AM, Paris joins at 10:00 AM. That's an hour into the Paris day, so a London call at that time is easy for Paris. A London call at 5:00 PM is 6:00 PM in Paris, after the Paris team's usual close.
For a weekly meeting, 11:00 AM Paris time is a reliable slot. It's 10:00 AM in London, and the shared window from 10:00 AM to 5:00 PM Paris is 9:00 AM to 4:00 PM in London. Both countries change their clocks on the same weekends, so the slot holds.
For a recurring Paris-led call, write the invite with both times: "Weekly, 11:00 AM Paris / 10:00 AM London". Both countries change clocks on the same weekends, so the pair stays correct. If someone proposes a time without naming a city, ask which clock they used before you accept the invite.
Frequently Asked Questions
What is the time difference between Paris and London?
London is 1 hour behind Paris. Paris uses CET or CEST, London uses GMT or BST, and both change on the same weekends.
What time is 9 AM in Paris in London?
9:00 AM in Paris is 8:00 AM in London, on every date. 12:15 AM in Paris is 11:15 PM the previous day, the previous day.
Does daylight saving change the Paris-London difference?
No. On the last Sunday in March and the last Sunday in October both cities switch at once, so the 1 hour gap never moves.
What is the best time to schedule a Paris-London call?
Between 10:00 AM and 5:00 PM Paris time, which is 9:00 AM to 4:00 PM in London. That keeps each team inside regular hours.